Yet another App.net client just hit the App Store. Appeio, an iPhone app that gives you access to your stream and lets you interact pretty much like you do on the web, is actually a device responsive client that can be accessed through the web.
My first impressions of it is that there is work to do. Is not that responsive, buttons to reply, star, etc are too small and light-colored, no gestures, no way to see every post individually.
I got my hopes on AppApp, which continues to be on beta and on Alpha, that apparently still waiting for review.
You can checkout Appeio for free in the App Store [iTunes Link].